<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>my blog</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet"
        integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
    <style>
        .selector-for-some-widget {
            box-sizing: content-box;
        }
        .div{
           background-color: wheat;
        }
    </style>

</head>

<body>
    <h1 class="text-center">Hello, world!</h1>
    <div class="container text-center">
        <div class="row align-items-start">
            <div class="col">
                One of three columns
            </div>
            <div class="col">
                One of three columns
            </div>
            <div class="col">
                One of three columns
            </div>
        </div>
    </div>

    <div class="container">
        <div class="row">
            <div class="col-md-6">123</div>
            <div class="col-md-6">123</div>
        </div>
    </div>

    <br>
    <hr>

    <div class="container">
        <div class="row">
            <div class="col-md-4">
                <div class="row">
                    <div class="col-md-6">1</div>
                    <div class="col-md-6">2</div>
                </div>
            </div>
            <div class="col-md-4">2</div>
            <div class="col-md-4">3</div>
        </div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"
        integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz"
        crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.11.8/dist/umd/popper.min.js"
        integrity="sha384-I7E8VVD/ismYTF4hNIPjVp/Zjvgyol6VFvRkX/vR+Vc4jQkC+hVqc2pM8ODewa9r"
        crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.min.js"
        integrity="sha384-0pUGZvbkm6XF6gxjEnlmuGrJXVbNuzT9qBBavbLwCsOGabYfZo0T0to5eqruptLy"
        crossorigin="anonymous"></script>

</body>

</html>